Stoker comprising furnace side wall fuel feed means



April 1951 J. s. BENNETT ETAL 2,550,521

STOKER COMPRISING FURNACE SIDE WALL FUEL FEED MEANS Filed April 24, 1946 2 Sheets-Sheet 1 =mlmlllll "2.

Q INVENTORS. 4 '3 oseph 6. Benn et% a 2,, By Ellen. If Th arson.

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11 h: 021mg P? 24, 1951 J. s. BENNETT ET AL 5 5 STOKER COMPRISINGFURNACE SIDE WALL FUEL FEED MEANS Filed April 24, 1946 2 Sheets-Sheet 2IN V EN TORS. Joseph 5. Bea/welt "0 BY Ellen WThorsoIz.

Patented Apr. 24, 1951 stroKEn COMPRISING FURNACE sins WALL FUEL FEEDMEANS Joseph S. Bennett, Merion, and Allen W. Thorson,

Narberth, Pa., assignors to American Engineering Company, Philadelphia,Pa., a corporation of Pennsylvania Application April 24, 1946, SerialNo. 664,566

G'Claifns.

' This invention relates to furnace stokers, and more particularly tostokers of the traveling grate spreader type.

One object of the present invention is to provide a stoker unitadaptedparticularly for use in connection with the larger furnaceinstallations.

A further object is to provide in a relatively long stoker furnace aplurality of fuel feeding and distributing mechanisms adjacent a sidewall thereof. 1

A still further object is to provide in a relatively long stoker furnaceof the traveling grate type a series of fuel feeding and distributingmechanisms disposed in spaced relation along a side Wall cf the furnaceto feed and distribute fuel over the entire grate area of said stoker.

Other and further objects will become apparent as the description of theinvention progresses.

Of the drawings:

Fig, 1 is a sectional 'elevational view taken through a furnace showinga stoker construction wherein the fuel feeding and distributingmechanisms are provided adjacent a side wall of the furnace, and g Fig;2 is a plan view taken substantially along line 2-2 of Fig. 1, certainparts being broken away to show more clearly the structure of theassociated fuel feeding and distributing mechanisms.

Figs. 1 and 2 disclose a furnace construction employing a relativelylong stoke'r ti. In this construction, the furnace comprises frontandrear walls 52 and 63, respectively, and side walls 64 and 65. type andcomprises a series of grate members 85 secured in any suitable manner tochains (not shown). The grate members at and chains extend aroundsprocket wheels 6'! and {it rotatably mounted at the opposite ends of asupporting framework 69. The framework 69, as shown more particularly inFig. l, is supported on a series of transverse I-beams IE3 which in turnare supported at the ends thereof in side walls E i and E5 of thefurnace. In this construction the inner surface of wall 63 has mountedin cooling relation therewith a series of fluid conducting tubes H whichare bent downwardly and rearwardly, as shown at 72, and terminate in aheader l3 mounted in any suitable manner exteriorly of the wall 63. Asealing plate id and any suitable packing material 55 are provided toprevent the leakage of furnace gases beyond the left hand end of stoker6i.

Sprocket wheels 67 and 68 are actuated by any Stoker 6! is of thetraveling grate be removed from time to time by any suitable means. Anysiftings passing between, the grate members 66 gravitate intoahopper '38provided beneath the stoker 6|, which has a discharge spout 19 connectedcentrally thereof through which the said siftings may be directed to aplace of disposal. I V e I Air for combustion enters the chamber 89 beneath the stoker 6| through an opening 8! provided in side wall 64, theair being supplied under pressure by any suitable fan or blowermechanism (not shown).

Fuel from a series of hoppers 82 mounted adjacent side wall 64 ispropelled into the furnace and distributed over the grate members 66through openings 83 provided in wall 64 by feeding and distributingrotors 84. Any suitable conveyer means is provided to convey the fuelfrom the hoppers 82 to the rotors 84. Each of the rotors 84 feeds anddistributes fuel over a predetermined area of the grate In theillustrative embodiment four feeding and distributing rotors 84 areprovided. It is obvious, however, that a greater or lesser number ofrotors 84 may be provided, depending upon the length of the grate ofstoker 6 I.

From the foregoing description it is seen that a stoker has beenprovided which is particularly adapted for use in the larger furnaceinstallations. In order to adapt spreader stokers for use in suchfurnaces, it is necessary to propel the fuel over the entire areathereof. This is accomplished by providing a long single stoker, and aseries of fuel feeding and distributing mechanisms located at spacedpoints along a side wall of the furnace. In this manner the entire areaof the stoker grate is supplied with fuel.

the feeding and distributing mechanisms is burned in suspension, theremainder of the fuel which consists essentially of the heavierparticles gravitates onto the stoker grates and is burned thereon asthey move slowly from one end of the furnace to the other.

While the embodiment herein ShOWn and described is admirably adapted tofulfill the objects primarily stated, it is to be understood that theinvention is not to be limited thereto, since it may be embodied inother forms, all coming within the scope of the claims which follow.

What is claimed is:

1. A furnace having front, rear, and relatively long side walls definingan elongated combustion chamber, one of said side walls having aplurality of longitudinally spaced openings therethrough above thebottom of said combustion chamber; and a stoker including a moving gratemounted at the bottom of said combustion chamber and below said openingsfor moving fuel deposited on said grate from one end of said combustionchamber to the opposite end thereof and a plurality of longitudinallyspaced fuel feeding and distributing means mounted along said one sidewall, one of said means operative through each of said openings, forfeeding anddistributing fuel to the grate transversely of the directionof movement of said grate and over the entire area of said grate.

2. A furnace as defined in claim 1, wherein the stoker is of thetravelling grate type.

3. A furnace having front, rear, and relatively long side walls definingan elongated combustion chamber, one of said side walls having aplurality of longitudinally spaced openings therethrough above thebottom of said combustion chamber; and a stoker including a moving gratemounted at the bottom of said combustion chamber and below said openingsfor moving fuel deposited on said grate from one end of said combustionchamber to the opposite end thereof and a plurality of longitudinallyspaced fuel feeding and distributing means mounted along said one sidewall, one of said means operative through each of said openings, forfeeding and distributing fuel to the grate transversely of the directionof movement of said grate and across the entire width of said grate,each of said feeding and distributing means supplying fuel to differentareas of said grate, each of which areas is of lesser length in thedirection of movement of said fuel than the total length of said grateand the total length of which areas in said direction is equal to thetotal length of said grate whereby the entire area of said grate iscovered with fuel.

4. A furnace as defined in claim 3 wherein the stoker is of thetraveling grate type.

5. In a, furnace having front, rear, and relatively long side wallsdefining an elongated combustion chamber, the combination of a movinggrate extending over the length of the combustion chamber and adapted tomove fuel deposited thereon from one end of said combustion chamber tothe opposite end thereof, and a plurality of fuel feeding anddistributing means disposed in spaced relation longitudinally along oneof said side walls and above said grate, said feeding and distributingmeans adapted to supply fuel across the entire width of said grate andtransversely of the direction of movement of said grate, the areas offuel supplied by the individual feeding and distributing means beingindividually of lesser length in the direction of movement of fuel bysaid grate than the total length of said grate and said areas jointlycovering the entire grate area.

6. In a furnace as defined in claim 5 wherein the grate is a travelinggrate.

JOSEPH S. BENNETT. ALLEN W. THORSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 266,328 Swindell Oct. 24, 1882510,550 Richards Dec. 12, 1893 510,578 Coxe Dec. 12, 1893 838,679 BoxDec. 18, 1906 984,197 Crowe Feb. 14, 1911 1,032,661 Earl July 16, 19121,198,841 Hand, Jr Sept. 19, 1916 1,421,419 Dersom July 4, 19222,271,967 Beers Feb. 3, 1942 2,387,600 Mosshart Oct. 23, 1945 2,390,155Kessler Dec. 4, 1945 FOREIGN PATENTS Number Country Date 14,958 GreatBritain Sept. 23, 1889 418,392 Germany Sept. 9, 1925 834,806 FranceSept. 5, 1938

